1. The problem statement, all variables and given/known data Hello, so i had a family party and my cousin was doing his physics homework so i decided to join in. now i'm at home and was playing with one of the problems that his teacher didn't assign and got an answer that i want to check because my teacher skipped the moment chapter(i go to community college and we ran out of time because we had a strike) so i really want to know if i got it. i can't remember what exactly the question said but i remember my sketch [m1]--[m2]-->4m/s cart 1 and cart 2 are connected as a train going 4m/s [m1]- *break* -[m2]-->7m/s cart 1 cart 2 what is the velocity of cart 1 2. Relevant equations P=mv 3. The attempt at a solution P = mv p=p' because of conservation of momentum? p = m1v1 + m2v2 v1 = (p - m2v2)/m1 this is where i'm kind of iffy... if together they go 4m/s does that mean they both go 4m/s or is it divided by 2 each?